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W. LANCASTER.

ALARM.

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IN VENJ'UH." M

n4: mums PETERS 00.. muroumov. msuma'rcm o c UNITED STATES V I/VILLIAMLANCASTER, OF SAYLESVILLE, RHODE ISLAND; MARGARET A.

LANCASTER ADMINISTRATRIX OF SAID WILLIAM LANCASTER, DE-

CEASED.

ALARM.

SPECIFICATION forrning part of Letters Patent No. 593,669, datedNovember 16, 1897'.

Application filed July 3, 1896. Serial No. 598,000. (No model.)

To all whom it may concern.-

Be it known that I, WILLIAM LANCASTER, of Saylesville, in the county ofProvidence and State of Rhode Island, have invented a new and usefulImprovement in Alarms; and I hereby declare that the following is afull, clear, and exact description of the same, reference being had tothe accompanying drawings, forming part of this specification.

This invention has reference to improvements in notification devices,and particularly to those which are applicable to steamboilers.

The object of the invention is to produce an improved device whereby analarm may be given for unduly high or low water or for high pressure inthe boiler.

Another object is to so construct a device of this nature that it may beWholly contained within the boiler While connected with an eX- posedwhistle or other indicating mechanism.

The invention consists of a counterweightlever pivotally mounted, afloat connected with the lever adapted to overbalance the counterweight,and a second float mounted to operate independent of the lever for highwater or be lifted by the lever for low Water.

The invention also consists in such other novel features of constructionand combination of parts as shall hereinafter be more fully described,and pointed out in the claim.

Figure 1 represents a side elevation of the improved device and itswhistle shown as set .in place on a steam-boiler, portions of which areshown in section. Fig. 2 represents a vertical sectional View ofportions of the lever, the valve-rod, the valve, and its Valve-chamber,the thickness of the boiler-shell being indicated in dotted lines. Fig.3 represents a cross-sectional view taken on a line a a, Fig.

2. Fig. 4: represents a similar View taken on a line b b, Fig. 2.

Similar letters and numbers of reference designate corresponding partsthroughout.

In the drawings, 5 indicates a portion of a steam-boiler, in which 0 0indicate the normal water-line. In the upper portion of the boiler is acircular hole or opening in which the valve-chamber is secured, ashereinafter described.

The whistle 6 is connected by a pipe with the upper invertedcup-shapedportion 7 of the valve-chamber. This cup-shaped portion 7 has ascrew-thread around its lower portion which screws into the upperthreaded portion of the annular casing 8, the lower end of which isadapted to be seated against the outer surface of the boiler 5, aroundthe opening therein. Into this opening is screwed the chambered bushingmember 9, having the shoulder 1O abutting against the inner surface ofthe boiler-shell, the rim 11, on which the casing 8 is screwed, and thependent arm 12, forked at its lower end. The lower end of the bushingmember has the perforation 13, and in the rim 11 is screwed thevalve-seat 14, through an axial perforation in which the valve 15extends, its upper end being seated in the valveseat.

To the forked portion of the arm 12 is pivoted the lever 16, having thering 17, the bearing 17, and the hooks 18 and 19. On the hook 18 is hungthe counterweight 20, and on the hook 19 is hung the rod 21, providedwith the frame 22, adjustable on the rod and carrying the float 23,formed of buoyant material, generally fire-tile.

To the valve 15 is secured the valve-stem 24, which extends down throughthe perforation 13 in the bushing member and through the ring 17 of thelever 16. At its lower end itis furnished with a frame 25, adjustable onthe stem and carrying a float 26, similar to the float 23, and adaptedto lift the valve-stem when partially immersed. On this'stein 24, abovethe ring 17 is adj ustably mounted the nut 27, against which thebearings 17 of the ring bear when the weighted end of the lever 16 israised. 1

When the water in the boiler is at its normal height, the weight 20 isbalanced by the float 23, as shown in the drawings. Should the level ofthe water be lowered from any cause, the float 23 will move down withthe water, the'weighted end of the lever 16 rising. If the lowering ofthe water continues sufficiently, this movement of the lever willeventually bring the bearings 17 against the nut 27 on the valve-stem24, lifting this stem and its valve and allowing steam to escape to thewhistle 6. If the water in the boiler should rise above the normal lineand reach the float 26, this float will rise on the water and thevalve-stem and its valve will be moved upward without reference to thelever 16, thus allowing the escape of steam to the whistle. Again, whenin starting up the boiler the water-supply valve is accidentally closedand the safety-valve is out of order the steam under hi gh pressure maypass through the perforations in the bushing 0 and cause the lifting" ofthe valve sufficiently to permit the escape of enough steam to operatethe whistle 6 and call attention to the dangerous condition of theboiler.

Having thus described my invention, I claim as new and desire to secureby Letters Patent The combination with the valve-chamber, comprising theinverted cup 7, the casing" t, the bushing member 9 having the shoulder10, the rim 11 to which the casing 8 is secured and the arm 12, thevalve-seat 14 secured in the rim 11, and the valve 15 mounted to movevertically in a perforation of the seat, of the lever 16 pivoted in thelower part of the arm 12 and having the ring 17, the weight 20 at oneend of the lever, the rod 21 depending from the opposite end of thelever and provided with the frame 22 and Heat 23, the frame 25adjustable on the rod 2-1 secured to the valve and extending through thering 17 adj ustable at the lower end of the red, the float 26 carriedthereby, and the nut 27 adjustable on the valve-stem above the ring 17,as described.

In witness whereof I have hereunto set my hand.

XVILLIAM LANCASTER. Vitnesses:

EDWIN BYE, Josnrn A. MILLER, Jr.

